AGFA d-lab.3 Digital Compact Lab

Repair
Printer
Latch
The LUTs are topped by a 16-bit Latch for each
colour. The Latches are used to synchronise and
buffer the asynchronous LUT data with the pixel
clock.
Digital Analogue Converter (DAC)
The DAC converts the 12-bit wide image date into
an analogue current between 0 and 20 mA as a
function of its clock. The Printer Mainboard holds a
DAC for each colour whose clock can be controlled
independent of the others (see 4.13. Pixel shift).
Current/Voltage Conversion & 50 Ohm Line Adjustment
The output currents are transformed to analogue
voltages which are amplified by operational
amplifiers and ride on the cables with 50 ohms
(RGB). The voltage amplitude is 0... 600mV.
Level Adjustment & Amplification
The circuit filters out the noise part of the energy of
the green and blue laser channels measured by the
monitor diode and amplifies the total noise
amplitude by a factor 10.
High Speed Analogue-Digital Converter (ADC)
The 2-channel ADC converts the amplified noise
signals of the green and blue laser channel to one
Byte each. Digitising is in real time for each colour,
i.e. at every pixel clock. The digital values are
validated in the FPGA for the calculation.
AGFA d-lab.3 2001-01-02 /PN 9009 6.3.23